Thank you for bringing this issue to our attention via the community.
We regret to hear that this Astro E1 cannot add enough power to your phone and so sorry for any unpleasant experience brought to you.
May I bother you to connect the included micro USB cable to the input and output port at the same time to reset the battery per elmo41683 's suggestion ( @elmo41683, thanks for your clarification)? After that, could you please use another working cable and test another phone to see if the problem persists?
If the Astro E1 still doesn't work as expected, you can contact us via firstname.lastname@example.org and we will be more than happy to help you out as per the 18-month warranty policy.
Sorry for the inconvenience caused and thanks for your understanding.